Clearance: Electrical panels must be installed in a readily accessible area with a minimum clearance of 30 inches (762 mm) wide, 3 ft (36 inches or 914 mm) deep, and 6. 5 feet (≈ 2 meter) high in front of the panel. The panelboard's door (hinged cover) shall be able to be opened to a. Working space: The front clearance, side clearance, and height clearance requirements for electrical equipment that provide a safe area for maintenance, inspections, and other work. The panel should also have space for efficient airflow, as it may overheat. NEC Article 408 covers switchboards, switchgear, and Panelboards installation and applications. The proper installation of a distribution box involves placing it at the right height to ensure safety and convenience. 26(A)(1), (A)(2), (A)(3), and (A)(4) or as required or permitted elsewhere in this Code. Walk into almost any garage or basement, and you'll see one of the NEC's most common red tags waiting to happen.